TY - JOUR
T1 - Effects of tube shape on flow and heat transfer characteristics in falling film evaporation
AU - Pu, Liang
AU - Li, Qiang
AU - Shao, Xiangyu
AU - Ding, Lan
AU - Li, Yanzhong
N1 - Publisher Copyright:
© 2018 Elsevier Ltd
PY - 2019/2/5
Y1 - 2019/2/5
N2 - Horizontal tube falling film evaporators are widely used in refrigeration and chemical industry. Two-dimensional numerical model with different tube shapes is established in this paper to simulate heat and mass transfer process with CFD method, and the heat transfer coefficient of simulation is also validated by experimental data. Flow and heat transfer characteristics of falling film evaporation on a circular tube and three flat tubes are investigated, respectively. It is confirmed that the liquid film becomes thinner and thinner as height-width ratio increases and average film thickness of three flat tubes is nearly 2.9–16.5% smaller than that of circular tube 1. Additionally, the cross sections of flat tube have a lower dimensionless temperature and a thinner thermal boundary layer, which means a better heat transfer performance compared with the circular tube 1. The average heat transfer coefficient of three flat tubes is approximately 2.2%, 4.2% and 11.2% higher than that of the circular tube, respectively.
AB - Horizontal tube falling film evaporators are widely used in refrigeration and chemical industry. Two-dimensional numerical model with different tube shapes is established in this paper to simulate heat and mass transfer process with CFD method, and the heat transfer coefficient of simulation is also validated by experimental data. Flow and heat transfer characteristics of falling film evaporation on a circular tube and three flat tubes are investigated, respectively. It is confirmed that the liquid film becomes thinner and thinner as height-width ratio increases and average film thickness of three flat tubes is nearly 2.9–16.5% smaller than that of circular tube 1. Additionally, the cross sections of flat tube have a lower dimensionless temperature and a thinner thermal boundary layer, which means a better heat transfer performance compared with the circular tube 1. The average heat transfer coefficient of three flat tubes is approximately 2.2%, 4.2% and 11.2% higher than that of the circular tube, respectively.
KW - Computational fluid dynamics (CFD)
KW - Falling film evaporation
KW - Film thickness
KW - Heat transfer coefficient
UR - https://www.scopus.com/pages/publications/85056868985
U2 - 10.1016/j.applthermaleng.2018.11.043
DO - 10.1016/j.applthermaleng.2018.11.043
M3 - 文章
AN - SCOPUS:85056868985
SN - 1359-4311
VL - 148
SP - 412
EP - 419
JO - Applied Thermal Engineering
JF - Applied Thermal Engineering
ER -